Intel 80310 I/O Processor Chipset AAU Coding Techniques

Intel ® 80310 I/O Processor Chipset AAU Coding TechniquesExample Calling Source Codeu32 NDA; /* next descriptor address [READONLY] */u32 SAR[AAU_SAR_GROUP]; /* src addrs */u32 DAR; /* destination addr */u32 BC; /* byte count */u32 DC; /* descriptor control */u32 SARE[AAU_SAR_GROUP]; /* extended src addrs */} aau_desc_t;/* user SGL format */typedef struct _aau_sgl{aau_desc_t aau_desc; /* AAU HW Desc */u32 status; /* status of SGL [READONLY] */struct _aau_sgl*next; /* pointer to next SG [READONLY] */void *dest; /* destination addr */void *src[AAU_SAR_GROUP]; /* source addr[4] */void *ext_src[AAU_SAR_GROUP]; /* ext src addr[4] */u32 total_src; /* total number of source */} aau_sgl_t;/* header for user SGL */typedef struct _aau_head{u32 total; /* total descriptors allocated */u32 status; /* SGL status */aau_sgl_t *list; /* ptr to head of list */aau_callback_t callback; /* callback func ptr */} aau_head_t;The function will call aau_start() and start the AAU after it queuesthe SGL to the processing queue. When the function will eithera. Sleep on the wait queue aau->wait_q if no callback has been provided, orb. Continue and then call the provided callback function when DMA interrupt68 White Paper